This is an idea that needs to stop. Ryan/Flacco will not be the "next Manning/Brady" or "Manning/Brady of this generation". If there are two quarterbacks that ware going to do that, it will be Ben Roethlisberger (Tom Brady) and Aaron Rodgers (Peyton Manning). They've even begun to start "mimicking their careers". Roethlisberger had early, quick success winning two championships. Rodgers has a huge arm, great accuracy, and is one of the finest quarterbacks in the league.
Ryan and Flacco have shown zero glimpses of anything Brady or Manning-esque.